But if blogging is journalism, then some of its practitioners seem to have learned the trade from Jayson Blair. Many repeat things without bothering to check on whether they are true, a penchant political operatives have been quick to exploit. "Campaigns understand that there are some stories that regular reporters won't print. So they'll give those stories to the blogs," says Christian Grantham, a Democratic consultant in Washington who also blogs. He cites the phony John Kerry/secret girlfriend story spread by bloggers in the 2004 primaries. The story was bogus, but no blogger got fired for printing the lie. "It's not like journalism, where your reputation is ruined if you get something wrong. In the blogosphere people just move on. It's scurrilous," Grantham says.

And though they have First Amendment protection and posture as patriotic muckrakers in the solemn pursuit of truth, the blog mob isn't democratic at all. They are inclined to crush dissent with the "delete" key. When consultant Nick Wreden criticized credit card banking giant MBNA on his blog, a reader responded in support of MBNA. Wreden zapped the comment. "I just thought: This has to be a plant,'" he says.

"It almost takes on the feeling of a crusade," says Jeffrey Schneider, a vice president at Walt Disney Co.'s ABCnetwork. "They put out a call to arms:We're going to take these guys down, and we won't stop blogging until someone loses their head.'" ABC News correspondent Linda Douglass came under attack from rampaging bloggers last March in covering the Terri Schiavo right-to-die case. She had cited a controversial memo written by a Republican staffer. Right-wing bloggers using such pen names as Right Pundit and Mr. Right (the latter hosted by Google) claimed she had fallen for a fake; the memo was real.

In that case the bloggers slinked away. In the case of a CNN executive they didn't stop until they had claimed a casualty. Eason Jordan, chief news executive at CNN, noted at an off-the-record conference in January that journalists had been killed by U.S. troops. He used a touchy word:"targeted." A blogger present, Rony Abovitz, ignored the off-the-record ground rule and posted an account. Other bloggers soon piled on. One created a site solely devoted to the topic, easongate.com.

Jordan instantly and repeatedly denied the assertions, but the blog hordes kept wailing away. Jordan resigned in February, engulfed by a concocted controversy. Blogger Michelle Malkin crowed online, praising nine other bloggers and "legions of smaller" ones in the hunt. She wrote that the mainstream media "calls it a lynch mob. I call it a truth squad" and included a warning:"Cue the Carpenters music: We've OnlyJust Begun.'"

Even some bloggers see the harm they can pose. "Some people in the blogosphere are too smug about free speech. They'll say it's okay if people get slandered or if people make up fake stuff because in the end the truth wins out," says John Hinderaker, a lawyer in Minneapolis, Minn. who helps run a right-wing blog, Power Line, which hounded CNN's Jordan and CBS anchor Dan Rather. "But I don't think that excuses it."

When Hinderaker published an item saying left-wing bloggers should stop assaulting a White House reporter alleged to have worked as a gay prostitute, his blog brethren went on the assault, publishing his phone number at work and prompting a deluge of harassing phone calls and e-mails. "My secretary was crying" because callers kept swearing at her, he says. "Then we started getting calls at the house. My wife wanted to hire a bodyguard."

Google and other carriers shut down purveyors of child porn, spam and viruses, and they help police track down offenders.So why don't they delete material that defames individuals? Why don't they help victims identify their attackers? Because they are protected by the Communications Decency Act of 1996, which frees a neutral carrier of Internet content from any liability for anything said online.

"Blogging is still in its infancy. Imposing regulations would create a chilling effect," says Annalee Newitz, until recently a policy analyst at the Electronic Frontier Foundation, a nonprofit that defends anonymous attackers. The anonymous assault has a long tradition in American political discourse, recognized by a U.S. Supreme Court ruling in McIntyre v. Ohio Elections Commission in 1995 and in a recent decision by the Delaware Supreme Court refusing to force an Internet service provider to disclose who called a small-town politician inept.

But even the Constitution doesn't give a citizen the right to unjustly call his neighbor a child molester. Google and the like argue they bear no more responsibility for content than a phone company does for slander over its wires. But Google's blog business looks less like a phone company and more like a mix of reality TV and an online magazine. Bloggers provide the fare, and Google maintains it for them free of charge, sometimes selling ads.

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